Revert of Factor Chrome details out of update manifest fetching.

chrome/browser/metrics/chrome_metrics_service_accessor.h

Index: chrome/browser/metrics/chrome_metrics_service_accessor.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.h b/chrome/browser/metrics/chrome_metrics_service_accessor.h
index 826648c9d984cdde9d410199193944db3b4514b9..37b02853bc221091c3fff69856456d1adb5749f1 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.h
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.h
@@ -13,7 +13,6 @@
 #include "chrome/browser/metrics/metrics_service_accessor.h"
 
 class ChromeBrowserMetricsServiceObserver;
-class ChromeExtensionDownloaderFactory;
 class Profile;
 
 namespace {
@@ -22,6 +21,8 @@
 }
 
 namespace extensions {
+class ExtensionDownloader;
+class ManifestFetchData;
 class MetricsPrivateGetIsCrashReportingEnabledFunction;
 }
 
@@ -40,10 +41,11 @@
  private:
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
   friend class ::ChromeBrowserMetricsServiceObserver;
-  friend class ChromeExtensionDownloaderFactory;
   friend class ChromeRenderMessageFilter;
   friend class ::CrashesDOMHandler;
   friend class DataReductionProxyChromeSettings;
+  friend class extensions::ExtensionDownloader;
+  friend class extensions::ManifestFetchData;
   friend class extensions::MetricsPrivateGetIsCrashReportingEnabledFunction;
   friend class ::FlashDOMHandler;
   friend class system_logs::ChromeInternalLogSource;